﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace _001_字符串string
{
    class Program
    {
        static void Main(string[] args)
        {
            StringBuilder sb = new StringBuilder("ww.4399.com",100);
            sb.Insert(0, "https://");
            sb.Remove(0, 3);
            sb.Replace("43", "34");
        }
    }
}
